Liquid applicator

ABSTRACT

A liquid applicator includes: a reservoir disposed in a barrel body and storing an application liquid such as a fluid cosmetic or the like; an application part fixed to a front end part of the barrel body by means of a joint and a front barrel so as to be put into contact with a target site to apply the application liquid to the site; and, a propelling mechanism disposed in the rear part of the barrel body to propel the application liquid from the reservoir to the application part, and wherein a delivery opening is formed in a front end of the application part and, at least, a surface of the application part around a deliver opening is formed of a high thermal conductivity material.

This Nonprovisional application claims priority under 35 U.S.C. §119 (a)on Patent Application No. 2013-021170 filed in Japan on 6 Feb. 2013, theentire contents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to an liquid applicator that includes: areservoir disposed in a barrel and storing an application liquid such asa fluid cosmetic or the like; an application part fixed to the front endof the barrel to be put into contact with a target site and apply theapplication to the site, and a propelling mechanism disposed in the rearpart of the barrel to propel the application liquid from the reservoir,and can apply the application liquid as sliding the application partover a target site such as the skin and the like.

(2) Description of the Prior Art

Generally, the applicators (liquid applicators) for applying anapplication liquid such as a liquid cosmetic are configured to be ableto push the application liquid from the reservoir arranged in the barrelto the delivery port of the soft application part arranged at the frontend of the barrel and apply the application liquid to a target site suchas the skin or the like while sliding the application part over thetarget site.

As an example of the above liquid applicators having an application partmade of silicone resin, a application part made of silicone rubber hasbeen disclosed in Japanese Patent Application Laid-open 2006-158949(Patent Document 1). Also, an application part made of urethane resinhas been disclosed in International Publication WO2010-16572 (PatentDocument 2).

However, in these technologies, the application parts are formed of softmaterials, so that it is impossible to meet the demand for applicationwith a firm and solid sensation.

In contrast to this, Japanese Patent Application Laid-open 2000-185779(Patent Document 3) discloses an applicator having an application partwith a metallic cover. Japanese Patent Application Laid-open 2009-39509(Patent Document 4) discloses an applicator using a metal member as itsapplication part in order to deal with a thermal process on the skin.

However, even with the applicator of the above Patent Document 3, theapplication part referred to as a cover is thin and elastic, so that itis impossible to apply the liquid firmly.

Further, though Patent Document 4 presents an applicator having ametallic application part, the delivery hole of the application liquidis formed from resin, so that no cool feeling intrinsic to metal can notbe obtained upon application.

SUMMARY OF THE INVENTION

In view of the above problem, it is therefore an object of the presentinvention to provide an applicator that can produce a sensationintrinsic to a metallic member during application, implement firmapplication and present design peculiar to a metallic member.

The present invention resides in a liquid applicator comprising: areservoir disposed in a barrel body and storing an application liquidsuch as a fluid cosmetic or the like; an application part fixed to afront end part of the barrel body by means of a joint and a front barrelso as to be put into contact with a target site to apply the applicationliquid to the site; and, a propelling mechanism disposed in a rear partof the barrel body to propel the application liquid from the reservoirto the application part, and wherein a delivery opening is formed in afront end of the application part and, at least, a surface of theapplication part around a deliver opening is formed of a high thermalconductivity material.

In the present invention, it is preferable that the application part isformed in the center of the front end part thereof, with a through-holethrough which the application liquid is delivered.

In the present invention, it is preferable that the application part isspherical.

In the present invention, it is preferable that the high thermalconductivity material in the application part is metal, and the part isformed by press forming.

According to the above, use of pressing forming to form the applicationpart can assure mass productivity without variation in accuracy. Inparticular, when press forming (punching) is implemented from theobverse side (the side in contact with the skin), the smooth or roundedside of the edge of holes appears on the obverse side while the roughedge forms on the interior side, so that it is possible to omit thepost-processing such as deburring after machining.

In the present invention, it is preferred that, at least, the surface ofthe application part has a thermal conductivity of 1 W/m·K or greater.

According to the present invention, use of a high thermal conductivitymaterial such metal or the like for the surface of the application partmakes it possible to give a preferable application sensation such as “apleasantly cool feeling” to the user upon application.

Further, use of metal not only can provide a firm application feelingbut also can impart an attractive design peculiar to metal to theproduct. Of course, use of a high the same effect.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A to 1E are illustrative diagrams of a liquid applicator using ametallic member as an application part according to the first embodimentof the present invention, FIG. 1A an overall vertical sectional view,FIG. 1B a side view with its cap vertically cut out, FIG. 1C a verticalsectional view of an application part according to a variational exampleof the first embodiment, FIG. 1D a front view of an application part,and FIG. 1E a vertical sectional view of an application part;

FIGS. 2A to 2E are illustrative diagrams of a liquid applicatoraccording to the second embodiment, FIG. 2A an overall verticalsectional view, FIG. 2B a vertical sectional view of an application partof a variational example 2-1 of the second embodiment, FIG. 2C avertical sectional view of an application part of a variational example2-2 of the same, FIG. 2D a vertical sectional view of an applicationpart of a variational example 2-3 of the same, and FIG. 2E a verticalsectional view of an application part of a variational example 2-4 ofthe same;

FIGS. 3A to 3E are illustrative diagrams of a liquid applicatoraccording to the third embodiment, FIG. 3A an overall vertical sectionalview, FIG. 3B a vertical sectional view of an application part of avariational example 3-1 of the third embodiment, FIG. 3C a front view ofthe application part of variational example 3-1, FIG. 3D a verticalsectional view of an application part of a variational example 3-2 ofthe same, and FIG. 3E a vertical sectional view of the application partof variational example 3-2;

FIG. 4 is an overall vertical sectional view of a liquid applicatoraccording to the fourth embodiment and FIG. 4B is an overall verticalsectional view of a liquid applicator according to the fifth embodiment;and,

FIG. 5A is an overall vertical sectional view of a liquid applicatoraccording to the sixth embodiment and FIG. 5B is an overall verticalsectional view of a liquid applicator having an application partaccording to the seventh embodiment as a modification.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The embodiments of the present invention will hereinafter be describedin detail with reference to the drawings.

A liquid applicator according to the first embodiment will be describedbased on FIGS. 1A and 1B.

The liquid applicator of the first embodiment, as shown in FIGS. 1 and1B, is constructed such that an application liquid such as a cosmeticfor lips or cheeks is stored in a reservoir 12 arranged inside a barrelbody 10, an application part 14 that is put into contact with a targetsite such as the skin of the user is fixed to a front end part 10 a ofbarrel body 10 by means of a front barrel 28 and a joint 30, and theapplication liquid stored in reservoir 12 of barrel body 10 is pushedtoward application part 14 by means of a propelling mechanism 16arranged in the rear part of barrel body 10, and delivered from deliveryholes 14 a of the application part 14.

The application part 14 has delivery holes 14 a opened in the front endpart, and at least, the periphery of delivery holes 14 a on the frontface of application part 14, is formed of metal. In the embodiment,application part 14 provided in the front end of front barrel 28 isformed of a high thermal conductivity material of metal.

In further detail, the liquid applicator includes, as its essentialcomponents, application part 14 as an outer sleeve, barrel body 10,front barrel 28, joint 30 and propelling mechanism 16 and a cap 10 b.

In this liquid applicator of the embodiment, the application liquid suchas a fluid cosmetic stored in reservoir 12 of the barrel body has aviscosity ranging from 0.3 Pa·sec to 50 Pa·sec at a shear rate of 5sec⁻¹ at 25 deg.C.

The propelling device 16 includes a piston body 18 that moves forwardand backward with respect to reservoir 12 inside the barrel body 10 toreduce and increase the volume of the storage space, and a drivearrangement (including a rotary actuator 22, a shaft member (also called“screw rod”) 20, fixed sleeve and others) for moving the piston body 18forward and backward by moving shaft member 20, which is disposed withits front end engaged with the rear end of the piston body 18, forwardand backward, by user's operational force.

[Barrel Body 10]

Barrel body 10 has an approximately hollow cylindrical configurationwith its front end part 10 a reduced in diameter. The outside diameterof the front end part 10 a is formed approximately equal to the insidediameter of cap 10 b. Cap 10 b is detachably fitted to the front endpart 10 a. Rib-formed ridges and grooves are formed on the portionswhere front end part 10 a and cap 10 b oppose when these are set inplace, to create a snap-fit joint so that cap 10 b will not come offfrom front end part 10 a by unintentional force. Preventing cap 10 bfrom coming of f from the barrel body due to unintentional force makesit possible to improve air-tightness and prevent evaporation of theapplication liquid from application part 14 and therearound.

Liquid-tightly fitted into the opening of front end part 10 a of barrelbody 10 is the rear end part of the approximately cylindrical frontbarrel 28 with joint 30 disposed therein. The front end of this frontbarrel 28 has an opening, on which application part 14 is fixed toconfine the opening. Further, the flange-shaped portion at the rear endof joint 30 is abutted against the rear end of front barrel 28 that isfitted into the bore of front end part 10 a of barrel body 10, so as toprevent front barrel 28 from coming off.

Arranged in the rear part of barrel body 10 is propelling mechanism 16.Piston body 18 of this propelling mechanism 16 is inserted from the rearend opening of barrel body 10, and is slidably disposed in tightlycontact with the inner wall in the center part of the body. The spaceenclosed by the interior wall of barrel body 10, the rear end part offront body 28 and joint 30, and the front face of piston body 18 formsreservoir 12 of the application liquid. [Propelling Mechanism 16]

As shown in FIG. 1, in the liquid applicator of the embodiment,propelling mechanism 16 integrally assembled in the rear part of barrelbody 10 is provided. Propelling mechanism 16 causes piston body 18 asits component to slide in liquid-tight contact with the inner wall inthe central part of barrel body 10 by the user's operation, to therebyreduce and increase the volume of the reservoir 12 and pressurize anddepressurize the application liquid.

Propelling mechanism 16 includes, as it main components, rotary actuator22, shaft member 20, fixed sleeve 24 for taking the shaft member 20 inand out (these correspond to the drive arrangement) and theaforementioned piston body 18.

Rotary actuator 22 is formed of an outer sleeve cap 32 and an innersleeve 26 that are jointed to each other in an unrotatable manner, androtatory actuator 22 as a whole is arranged in a rotatable mannerrelative to barrel body 10. Shaft member 20 is arranged slidably in theaxial direction, and fixed in the rotational direction, relative to thisrotary actuator 22.

[Fixed Sleeve 24]

Fixed sleeve 24 is formed of an annular member and is attached to barrelbody 10 unmovably in both the rotational and axial directions. The innerperiphery of fixed sleeve 24 is formed with a female thread so as tomate with the male thread on the outer periphery of shaft member 20. Asrotary actuator 22 is rotated, shaft member 20 rotates and moves axiallythanks to the male thread of shaft member 20 mating with the femalethread of fixed sleeve 24 so that piston body 18 moves forward andbackward.

Further, the meshing portion, designated at 34 between fixed sleeve 24and rotary actuator 22 (the outer peripheral side in the front part ofinner sleeve 26) is formed with a ratchet structure. Rotary actuator 22is rotatable in both directions relative to fixed sleeve 24 (barrel body10 to which the sleeve is fixed). More specifically, when the rotaryactuator is rotated in one direction that allows for delivery of theliquid cosmetic or the application liquid, this ratchet structureimplements delivery of the liquid while causing the user to feel aclicking sensation on the fingers. When the rotary actuator is rotatedin the other direction, the rotation is restrained.

As to restriction on rotation, if a torque limiter function for allowingrotation when a rotational force equal to or greater than a certainlevel is acted between outer sleeve cap 32 and inner sleeve 26 as theparts of rotary actuator 22 is added, it is possible to prevent thepropelling mechanism from being broken. That is, if the applicationliquid is an antibacterial one such as a silicone oil-based liquidcosmetic for lips, provision of propelling mechanism 16 having afunction of reducing the pressure of the application liquid insidereservoir 12 of barrel body 10 by rotating the rotary actuator 22 in theother direction, enables propelling mechanism 16 to reduce the pressureof the application liquid after the propelling mechanism 16 has stoppedpressurizing the application liquid, hence draw back the applicationliquid from delivery holes 14 a of application part 14 into theapplication liquid conduit, designated at 30 a, inside joint 30.

On the other hand, if the application liquid is a water-based one whichis prone to breed bacteria when the liquid touches the human skin orsaliva, propelling mechanism 16 may and should be configured so thatmeshing portion 34 of the rotary actuator 22 is limited to rotate in theother direction and stops rotating, to thereby prohibit the applicationliquid from returning to reservoir 12.

[Rotary Actuator 22, Inner Sleeve 26]

Rotary actuator 22 is formed of outer sleeve cap 32 and inner sleeve(also called “propelling part”) 26 which are connected to be unrotatableto each other under normal condition and become rotatable when a certainrotational force or greater is applied, and rotary actuator 22 as awhole is arranged rotatably in the rear part of barrel body 10.

[Front Barrel 28, Joint 30]

As shown in FIG. 1, front barrel 28 is an approximately hollow cylinderhaving a front endface, cut obliquely relative to the axis, and formedwith a small-diametric opening 28 a near the center thereof and alarge-diametric rear part with its rear end open. The rear part of frontbarrel 28 is air-tightly fitted into front end part 10 a of barrel body10. Application part 14 is fitted into opening 28 a at the front end offront barrel 28.

As shown in FIG. 1, the joint 30 is an approximately hollow cylinderhaving application liquid conduit 30 a with its outer peripheral side ofthe front and rear parts are fitted inside front barrel 28. Applicationliquid conduit 30 a is adapted to have an optimal diameter by takinginto account the fluid resistance depending on the viscosity of theapplication liquid and other factors.

Detailedly, joint 30 has an approximately cylindrical configuration aswhole constructed such that the rear part is made greater stepwise indiameter than the front part and that application liquid conduit 30 ahaving an approximately the same diameter forming an interior hollowthat penetrates through the inside from the front part to the rear partin the axial direction is provided from the front to the middle part. Aplurality of rib-like or semicylindrical annular projections are formedon the outer peripheral side of the rear large-diametric part of joint30 and inserted into the front barrel. A flanged portion is formed inthe rear end of joint 30 and abutted against the rear end of frontbarrel 28.

Here, as to the material of each component in the embodiment, shaftmember 20 and fixed sleeve 24 can be formed of ABS resin, piston body 18and front barrel 28 can be formed of HDPE (high density polyethylene),and barrel body 10, cap 10 b and external sleeve cap 32 can be formed ofPP (polypropylene). For each component, other kind of resin may be usedas appropriate. Fixed sleeve 24 may be made of PC (polycarbonate) resin,or POM (polyacetal) resin.

[Application Part 14]

As shown in FIGS. 1A and 1B, the application part 14 is a punch-formedmetallic flat plate of an approximately circular shape with a pluralityof delivery holes 14 a formed therein. The circumference is rounded sothat the application part assumes a dish-like configuration.

Specifically, the liquid applicator of the first embodiment is anapplicator for delivering liquid stain for lips and cheeks as anapplication liquid, and is attached with application part 14 which ismade of metal or the like having a high thermal conductivity, has beenformed by boring delivery holes 14 a by metal etching and pressed into adish-like form with its periphery rounded, as shown in FIGS. 1D and 1E.Alternatively, the application part may be formed by boring deliveryholes 14 a by punch press forming, bending the periphery and punchingout the circumference by progressive die or simple die.

A suitable clearance 14 b is formed between the front end of joint 30 ofthe inner sleeve (hole) of front barrel 28 and the inner surface ofapplication part 14 (metal member) so that the liquid can be ejectedfrom all the delivery holes 14 a formed in application part 14.

Application part 14 of a high thermal conductivity material, preferablyuses high thermal conductivity materials having a thermal conductivityof 1 or higher such as stainless steel, glass, aluminum, duralumin andcarbon steel. Among these, stainless steel, which does not need surfacetreatment such as plating and the like, is most preferable because theapplication part would contact with the liquid and the skin.

Further, if the edges of delivery holes 14 a in application part 14 areburred, there is a risk of the skin and others being injured uponcontact with the application part, it is preferable to polish theapplication part. This polishing may be preferably done by electrolytepolishing.

As to the surface of application part 14 of the present embodiment, theshape and size of each hole and the layout of multiple holes are notparticularly specified. For example, the holes may be arranged like acinquefoil having a slightly greater center hole with smaller holestherearound.

Further, the metal member of application part 14 may be projected fromthe front barrel base (which is assumed to be made of resin) so as todirectly contact the skin (lips), whereby the user can feel comfortableon the skin (lips) and spread the liquid easily. Instead of a flatplane, the metal member may be formed with curvature by press-forming orother methods.

The plate thickness of application part 14 may be 0.1 mm to 1.0 mm, andmore preferably 0.15 mm to 0.3 mm. With a thickness less than 0.15 mm,application part 14 is felt flexed upon application, whereas with athickness of 1.0 mm or greater, it is difficult to shape the plate andcontrol the size (pitch) of the holes.

It is also possible to form application part 14 integrally with frontbarrel 28 by insert molding.

Alternatively, it is possible to fix the application part metallicmember by holding it with front barrel 28 and joint 30.

The present invention should not be limited to the above firstembodiment, various variations can be implemented.

Though in the first embodiment, joint 30 of the liquid applicator fillsup the interior of front barrel 28 as shown in FIG. 1A, it is possibleto create a space from front barrel 28 by using multiple parts incombination as in a variational example shown in FIG. 1C. Applicationpart 14 is formed of divided parts, and an inner tube for leading theapplication liquid to right below the metal member is provided. Thisinner tube is coupled with joint 30. The joint 30 of this variationalexample is composed of multiple parts, i.e., two approximately cup-likefront and rear end parts formed with a hollow tube in the axial centerthereof and a tube arranged in the middle part that connects between thefront end part and the rear end part.

Next, the liquid applicator of the second embodiment will be describedwith reference to FIG. 2.

As shown in FIG. 2, the liquid applicator of the second embodiment is anapplicator having a spherical application part 14 formed in the centerthereof with a through-hole for supplying the application liquid.Application part 14 is formed of a high thermal conductivity materialsimilar to the first embodiment. The configurations of propellingmechanism 16 and other components are the same as those of the liquidapplicator of the first embodiment with the same reference numeralsallotted.

Detailedly, as shown in FIG. 2A, the rear part of joint 30 is large indiameter, forming a cylindrical member 30 c, from which a tubular member30 d is extended forward. The front end of tubular member 30 d isinserted into, and joined to, through-hole of application part 14, sothat application part 14 is fixed to joint 30.

Tubular member 30 d is preferably formed of stainless steel as thespherical part is.

As to the dimensions of tubular member 30 d, the wall thickness ispreferably 0.05 to 0.5 mm, more preferably 0.1 to 0.3 mm because themember needs to support the spherical part.

The inside diameter of tubular member 30 d is preferably 0.5 to 3 mm, inconsideration of fluid resistance depending on the viscosity of theapplication liquid.

Since application part 14 is a metallic sphere, it is possible to give acool feeling when the applicator is used and applied on a target sitesuch as the skin while producing a smooth sensation when moved.

In the second embodiment, various variations can be configured as invariational examples 2-1 to 2-4 shown in FIGS. 2B to 2E.

In variational example 2-1 shown in FIG. 2B, an annular pressing rib 10c is projected in cap 10 b so that the pressing rib 10 c hermeticallyencloses delivery hole 14 a at the front end of application part 14.With this, it is possible to enhance air-tightness.

In variational example 2-2 shown in FIG. 2C, the rear end of tubularmember 30 d of joint 30 is enlarged in diameter like a flange so as toprevent the tubular member from coming off from cynical member 30 c.

In variational example 2-3 shown in FIG. 2D, the front end of frontbarrel 28 is beveled so that the front end can come into close contactwith rear end face of application part 14.

In variational example 2-4 shown in FIG. 2E, the front end face ofapplication part 14 around delivery hole 14 a is formed with a flatplane 14 a 1.

Next, the liquid applicator of the third embodiment will be describedwith reference to FIG. 3. As to the structures of propelling mechanism16 and others, the same components as in the first embodiment areallotted with the same reference numerals.

As shown in FIG. 3A, the liquid applicator of the third embodiment is anapplicator having a spherical application part 14 formed in the centerthereof with a through-hole (delivery hole 14 a) for supplying theapplication liquid. Application part 14 is formed of a high thermalconductivity material similar to the first embodiment.

Joint 30 is formed of a tapering cylindrical member 30 c being coveredby front barrel 28, fitted in front end part 10 a of barrel body 10, anda tubular member 30 d extended forward from front barrel 28 so thatapplication part 14 is disposed at the front end of the tubular member30 d.

In this third embodiment, since application part 14 is arranged at thefront end of long tubular member 30 d, the flexion of tubular member 30d can improve application feeling, and it is possible to apply theliquid at a site where the user's hand cannot reach, so that thisconfiguration is convenient for use.

In this third embodiment, as shown in FIG. 3A, pressing ribs 10 c areprovided in the bore of cap 10 b at the position where application part14 is located. This prevents application part 14 from slipping off dueto inertial force when the applicator falls with application part 14down. Pressing ribs 10 c are disposed so that when the cap is set inplace the ribs are positioned in contact with, or leaving slightclearance from, (the front end part of) application part 14.Specifically, pressing rib 10 is a plate-like piece extended rearwardinside the front end part of cap 10 b, and a plurality of pressing ribsare provided circumferentially apart from one another.

In the third embodiment, various modifications can be implemented. Invariational example 3-1 shown in FIGS. 3B and 3C, the front end facearound delivery hole 14 a of application part 14 and the rear end faceinto which tubular member 30 d is inserted are formed with flat plane 14a 1. In variational example 3-2 shown in FIGS. 3D and 3E, the front endface and rear end face of the application part 14 are formedspherically. In this way, the sphere of application part 14 can beformed in various shapes.

Next, the liquid applicators of the fourth and fifth embodiments will bedescribed with reference to FIG. 4. As to structures of propellingmechanism 16 and others, the same components as in the first embodimentare allotted with the same reference numerals.

As shown in FIG. 4A, the liquid applicator of the fourth embodiment isan applicator having a spherical application part 14 formed in thecenter thereof with a through-hole (delivery hole 14 a) for supplyingthe application liquid, and a brush 36 arranged in the through-hole.Application part 14 is formed of a high thermal conductivity materialsimilar to the first embodiment.

The liquid applicator of the fifth embodiment is, as shown in FIG. 4B,an applicator having a plurality of spherical application parts 14,penetrated on tubular member 30 d. Application part 14 is formed of ahigh thermal conductivity material similar to the first embodiment.

Next, the liquid applicators of the sixth and seventh embodiments willbe described with reference to FIGS. 5A and 5B. As to the structures ofpropelling mechanism 16 and others, the same components as in the firstembodiment and the same components as in the fifth embodiment areallotted with the same reference numerals.

As shown in FIG. 5A, the liquid applicator of the sixth embodiment is anapplicator having a plurality of spherical application parts 14 that arepenetrated on tubular member 30 d. Each spherical application part 14 isput in direct contact with other while an annular space 38 made ofelastic material such as rubber is disposed between the sides ofapplication parts 14. Annular spacer 38 has an axially short tubularconfiguration, arranged along tubular member 30 d. With thisarrangement, it is possible to improve attachment stability of sphericalapplication parts 14.

As shown in FIG. 5B, the liquid applicator of the seventh embodiment isan applicator having a plurality of spherical application parts 14 thatare penetrated on tubular member 30 d and spacers 38 made of elasticmaterial disposed between application parts 14. The spacer 38 in thiscase has a flat disk form with a hollow through which tubular member 30d is penetrated, and is interposed between application parts 14 so thatapplication parts 14 are floated without directly touching each other.When cap 10 b is attached, spacers 38 elastically compressed anddeformed by the pressure via application parts 14 from the cap 10 b.

According to the seventh embodiment, it is possible to improve theapplicator in design and adjust the fitting condition of cap 10 b whenviscoelastic material such as rubber, elastomer or the like is selectedfor spacers 38. Alternatively, when metal or resin is selected forspacers 38 and the spacers are attached marginally apart fromapplication parts 14, the applicator can be used as the spheres smoothlyrotate.

Though the above embodiments have been described by giving examples inwhich a twist-feed mechanism is used as the propelling mechanism, thepresent invention can adopt any other mechanism such as clicking types,tube types and other types as long as a cosmetic fluid or any otherapplication liquid can be delivered.

The liquid applicator of the present invention can also be used forapplicators for medicines in addition to cosmetics such as fluidcosmetics.

What is claimed is:
 1. A liquid applicator comprising: a reservoirdisposed in a barrel body and storing an application liquid such as afluid cosmetic; an application part fixed to a front end part of thebarrel body by means of a joint and a front barrel so as to be put intocontact with a target site to apply the application liquid to the site;and, a propelling mechanism disposed in the rear part of the barrel bodyto propel the application liquid from the reservoir to the applicationpart, and wherein a delivery opening is formed in a front end of theapplication part and, at least, a surface of the application part arounda deliver opening is formed of a high thermal conductivity material. 2.The liquid applicator according to claim 1, wherein the application partis formed in a center of the front end part thereof, with a through-holethrough which the application liquid is delivered.
 3. The liquidapplicator according to claim 1, wherein the application part isspherical.
 4. The liquid applicator according to claim 2, wherein theapplication part includes a metallic part machined by press-forming. 5.The liquid applicator according to claim 1, wherein, at least, thesurface of the application part has a thermal conductivity of 1 W/m·K orgreater.